Our people liked to eat the boiled rice wrapped in leaves of vegetables such as lettuce, pumpkin and so on from the old times.
The lettuce has its origin in the period of koguryo.
It improved the appetite in the hot summer.
Our people planted the lettuce on their gardens.
Now we can see that the lettuce grows in the gardens of farmhouses.
Wash the lettuce several times in the new water and add a few drops of oil into the last washing water.
Then the taste gets better.
It is the best to eat the boiled rice wrapped in leaves of lettuce with the hot pepper paste and Welsh onion.
According to the another record, if using the back side of lettuce, it is good to eat since the soft surface passes by the throat and mouth and the food never lies heavy on the stomach.
Our people paid special attention to the soy bean past.
According to the record, such paste was made by roasting the chopped beef, fish, welsh and onion together with oil.
In spring the unboiled edible grass such as leopard plant was used as material and in winter, in particular on the 15th  of January, laver was used.
People believed that if they ate the boiled rice wrapped with laver on the 15th of January, they could enjoy the happy life that year.
The leaves of bean and pumpkin were also used.
Such custom was limited only to Hamgyong province and Zezu Island.
In the old times the white rice did not grow well in Hamgyong province and so they wrapped the boiled millet wraped in the leaves of bean.
The leaves of bean supplemented vitamin or protein to the people of this area.
Such custom can be also found in Zezu Island because once upon a time many people of Hamgyong province moved to this island.
We can prove it by the fact that the people in both Hamgyong province and Zezu  island call lettuce “Puru” in Korean but ones in the middle and southern part call it “Sang chi” in Korean.
In the mean time the boiled rice wrapped with the leave of pumpkin was introduced lately.
Such custom was created at first in the southern part since the pumpkin began to be spreaded from the south to the north like the red pepper.
The people in the south also used the leave of pumpkin as the material of soup.